<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
#menu ul {
	list-style-type: none;
	margin: 0px;
	padding: 0px;
	position: relative;
}
#menu {
	background-color: #FF0;
	width: 160px;
}
#menu ul li ul {
	display: none;
	position: absolute;
	left: 100px;
}
#menu ul li:hover ul {
	display: block;
}
</style>
</head>

<body>
<div id="menu">
  <ul>
    <li>id "menu" 的内容</li>
    <li>
        <ul>
        <li>1</li>
        <li>2</li>
        </ul>
    </li>
    <li>id "menu" 的内容</li>
    <li>id "menu" 的内容</li>
    <li>id "menu" 的内容</li>
    <li>id "menu" 的内容</li>
    <li>id "menu" 的内容</li>
  </ul>
</div>
</body>
</html>
